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Protocols in ecological and environmental plant physiology

 

Article << Previous     |     Next >>   Contents Vol 35(7)

Photoprotection of PSII in Hawaiian lobeliads from diverse light environments

Rebecca A. Montgomery A D, Guillermo Goldstein B, Thomas J. Givnish C

A Department of Forest Resources, University of Minnesota, Saint Paul, MN 55108, USA.
B Department of Biology, University of Miami, Miami, FL 33124, USA.
C Department of Botany, University of Wisconsin, Madison, WI 53706, USA.
D Corresponding author. Email: rebeccam@umn.edu
 
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Abstract

Excess irradiance can reduce the quantum yield of photosynthesis via photoprotective energy dissipation, inactivation or downregulation of PSII. We examined variation in photoprotection as part of a study of adaptive radiation in photosynthetic light responses by Hawaiian lobeliads. We measured the maximum efficiency of PSII (Fv/Fm) and recovery of Fv/Fm after high light stress in field populations of 11 lobeliad species and in four species growing under common-garden greenhouse conditions. Species showed no difference in Fv/Fm (0.82 ± 0.02 (mean ± s.e.)) or in their ability to recover from light stress under field conditions. Average recovery was 74 ± 1.4% within 1 h of removal of the stress suggesting that all species maintain the ability to recover from high light stress, at least in the short-term. In contrast, the results from the common-garden indicate that long-term exposure to high irradiance and associated higher temperatures can cause a sustained reduction in PSII function. Species showed decreased Fv/Fm and percentage recovery as treatment irradiance increased. Fv/Fm and percentage recovery were positively related to native habitat PFD across species, suggesting that there has been a diversification in high light tolerance, with species from sunnier environments better able to avoid sustained declines in PSII function.

Keywords: adaptive radiation, chlorophyll fluorescence, common garden, non-photochemical quenching, photochemical reflectance index, xanthophyll-cycle pigments.


   
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